Expose the new stable APIs from ICU4J 70

According to the upstream API coverage report external/icu/icu4j/coverage-exclusion.txt,
the methods should have API coverage running in the existing CtsIcuTestCases.

Bug: 202948901
Test: m droid
Change-Id: If43f9f56f0bc4391a82b5dccbf57fc7cd99a8545
12 files changed